Update: Well I'll be confused/impressed/lucky?
Created a Virtual device with the ghost ID of 1263, gave it a driver and saved.
Works fine now.
I have many Xiaomi contact sensors that use the community Xiaomi Aqara Mijia driver.
I wanted to add another and I can't see to get them to pair anymore.
I have 3 and all of them fail with the same issue.
They show Device Found and pairing. Nothing happens until timeout but I get a 0000 device in the logs. If I look at the ZB device list (53 in total) I don't see any new entries but I get a rogue device in the graph.
I am pairing right next to the hub so no repeater influence and I have tried the alternatives suggested on the pairing screen.
Edit: Did a hub shutdown for 20 minutes and looked at the graph. I now have a ghost device 1263 but it's not in the ZB list.